Development of a PEFC with Parallel Hybrid Pattern Gas Channels (3rd Report, Effects of GDL Design Parameters on PEFC Performance in Interdigitated Gas Channels)

Toshiaki Konomi, Tatsumi Kitahara, Hironori Nakajima, Masanori Tashiro, Yasutaka Takazono

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

The effects of the areal weight and thickness of the GDL of a polymer electrolyte fuel cell (PEFC) have been analyzed using a cell with hybrid gas channels that can arbitrarily change the ratio of the flow rates between the interdigitated and parallel flows. We clarify that a decrease in the areal weight of the GDL reduces the pressure loss in in-plane direction of the GDL owing to the enhanced exhaust of accumulatd product water in liquid phase. Increased pore diameter also contributes to reduce the flow resistivity. On the other hand, 30% increase in the thickness of the GDL decreases the cross-sectional area ratio of through-pores (A/A0) due to further flooding in the GDL, leading to the decrease in the pressure loss of about 70% of that expected. In both the cases, cell voltage fluctuation from the instability of the exhaust of the liquid water under the operation at high air utilization remains to be solved.

Original languageEnglish
Pages (from-to)1010-1017
Number of pages8
JournalNihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B
Volume74
Issue number741
DOIs
Publication statusPublished - Jan 1 2008

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fuel cells
Fuel cells
Electrolytes
electrolytes
porosity
parallel flow
Parallel flow
polymers
Liquids
Polymers
cells
Gases
gases
water
Water
liquid phases
flow velocity
Flow rate
electrical resistivity
air

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Mechanical Engineering

Cite this

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title = "Development of a PEFC with Parallel Hybrid Pattern Gas Channels (3rd Report, Effects of GDL Design Parameters on PEFC Performance in Interdigitated Gas Channels)",
abstract = "The effects of the areal weight and thickness of the GDL of a polymer electrolyte fuel cell (PEFC) have been analyzed using a cell with hybrid gas channels that can arbitrarily change the ratio of the flow rates between the interdigitated and parallel flows. We clarify that a decrease in the areal weight of the GDL reduces the pressure loss in in-plane direction of the GDL owing to the enhanced exhaust of accumulatd product water in liquid phase. Increased pore diameter also contributes to reduce the flow resistivity. On the other hand, 30{\%} increase in the thickness of the GDL decreases the cross-sectional area ratio of through-pores (A/A0) due to further flooding in the GDL, leading to the decrease in the pressure loss of about 70{\%} of that expected. In both the cases, cell voltage fluctuation from the instability of the exhaust of the liquid water under the operation at high air utilization remains to be solved.",
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AU - Konomi, Toshiaki

AU - Kitahara, Tatsumi

AU - Nakajima, Hironori

AU - Tashiro, Masanori

AU - Takazono, Yasutaka

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AB - The effects of the areal weight and thickness of the GDL of a polymer electrolyte fuel cell (PEFC) have been analyzed using a cell with hybrid gas channels that can arbitrarily change the ratio of the flow rates between the interdigitated and parallel flows. We clarify that a decrease in the areal weight of the GDL reduces the pressure loss in in-plane direction of the GDL owing to the enhanced exhaust of accumulatd product water in liquid phase. Increased pore diameter also contributes to reduce the flow resistivity. On the other hand, 30% increase in the thickness of the GDL decreases the cross-sectional area ratio of through-pores (A/A0) due to further flooding in the GDL, leading to the decrease in the pressure loss of about 70% of that expected. In both the cases, cell voltage fluctuation from the instability of the exhaust of the liquid water under the operation at high air utilization remains to be solved.

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